Welcome

Executors and Images

Set up your build environment to run with the docker, machine, or macos executor and specify an image with only the tools and packages you need.

Docker

jobs:
  build: # name of your job
    docker: # executor type
      - image: buildpack-deps:trusty # primary container will run Ubuntu Trusty

Machine

jobs:
  build: 
    machine: 
      image: circleci/classic:201708-01 # VM will run Ubuntu 14.04 for this release date

macOS

jobs:
  build:
    macos:
      xcode: "9.0"
      
    steps:
      # Commands will execute in macOS container
      # with Xcode 9.0 installed
      - run: xcodebuild -version

See Also

Learn more about the pre-built CircleCI convenience images.